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<head>
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    <title>Document</title>
    <link rel="stylesheet" href="./restcss/restcss2011.css">
    <style>
        .nav{
            width: 1210px;
            height: 48px;
            line-height: 48px;
            margin: 50 auto;
            background-color: #E8E7E3;
            display: flex;
       
        }

        .nav li{
            /* 设置增长系数 */
            flex-grow: 1;
        }
        .nav a{
            display: block;
            color: #808080;
            text-decoration: none;
            font-size: 16px;
            text-align: center;
        }
        .nav  a:hover{
            background-color: #636363;
            color: #fff;
        }
    </style>
</head>
<body>
    <ul class="nav">
        <li>
            <a href="#">HTML/CSS</a>
        </li>
        <li>
            <a href="#">Browser Side</a>
        </li>
        <li>
            <a href="#">Server Side</a>
        </li>
        <li>
            <a href="#">Programming</a>
        </li>
        <li>
            <a href="#">XML</a>
        </li>
        <li>
            <a href="#">Web Building</a>
        </li>   <li>
            <a href="#">Reference</a>
        </li>
    </ul>
</body>
</html>